Trying to increase the airflow on my 86-6.9.in an effort to boost
power. I have not cranked up the fuel pump yet. It is not smoking
black under full throttle- but my fuel economy is pretty lousy (about
12-13 mpg city). Took off the long tube that runs from the air cleaner
to the radiator support and removed the foam element from the air
cleaner. I do not live in an inherently dusty area- so I'm not real
concerned about the foam element. I use either NAPA or Wix filters
because of their density and filtering ability- perhaps causing too much
restriction? Any other ideas? thanks bill
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I am the one that posted the air pump fell off post. I would be happy to
share the numbers. I didn't drive the truck to work today and the results
are in the glove box. I will try to send them tomorrow.

What you want to really stay away from is an F-250 with a 302 and 3.55
gears. In one word, gutless. The six makes much more torque at usable rpm.
I recently changed gears to 4.56 in my F-250 with 302 and it has made a big
improvement, but I haven't towed yet because I am still in the gear break in
period. You can find stock F-250 with 4.10 gears, and is probably what you
want with either the six or the little 8 if you are going to do a lot of
towing. You can find the axle code on the drivers door sticker, and if the
seller still has the owners manual you can look up the code in there in the
towing section, to tell you what gears the truck has. If not post to list
and someone will decode it for you.

I have seen a lot of F250 with the six
cylinder engine. They seem to be less
expensive than the larger engines. some
people say they have a lot of torque. Can
they pull a trailer, such as one loaded at
6,500 lbs. If not, what use is this engine
in this series of vehicle. Anyone have
a comment on the subject?

Hello list dudes. to the guy who wants to put his entire truck in the air,
start the engine and engage the tranny (in 4-wheel drive no less) I might
suggest that this IS REAL DANGEROUS! You must have real confidence in your
jackstands etc. sounds kind of scary to me. At least make sure the truck
is not pointed toward your house!

Does anyone know of an aftermarket tranny cooler that is larger and better
than the stock unit mounted to the front of the radiator. I want to
upgrade this cooler but was hoping to find an aftermarket upgrade that
would bolt right up.

I wouldn't use WD-40 on the speedo cable. It will just attract dust and just
get things gummed up. Try a tube of graphite speedometer cable lubricant. It
is a fine graphite dust and will not harm the cable or housing. As far as the
12 m.p.h. jump, I don't have an answer on that.

>Hello list dudes. to the guy who wants to put his entire truck in the air,
>start the engine and engage the tranny (in 4-wheel drive no less) I might
>suggest that this IS REAL DANGEROUS! You must have real confidence in your
>jackstands etc. sounds kind of scary to me. At least make sure the truck
>is not pointed toward your house!
>

>Trying to increase the airflow on my 86-6.9.in an effort to boost
>power. I have not cranked up the fuel pump yet. It is not smoking
>black under full throttle- but my fuel economy is pretty lousy (about
>12-13 mpg city). Took off the long tube that runs from the air cleaner
>to the radiator support and removed the foam element from the air
>cleaner. I do not live in an inherently dusty area- so I'm not real
>concerned about the foam element. I use either NAPA or Wix filters
>because of their density and filtering ability- perhaps causing too much
>restriction? Any other ideas? thanks bill

Unless your truck has overdrive, your milage is about right. The diesels
suck fuel when running high rpms. It is just the way it is.

Our 89 4x4 with 7.3 diesel get 14 mpg empty or with a big camper. It has
C-6 and 4.10:1 gears. Just screams way too much.

As far as your air cleaner, I usually use NAPA ones too. I don't think it
makes a difference as long as you use a name brand one.

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